#top{
	width: 780px;
	height: 183px;
	background-color: aqua;
}
#banner{
	background-image: url(../images/banner.jpg);
	background-repeat: no-repeat;
	height: 150px;
}
#nav{
	text-align: center;
}
#nav ul{
	list-style: none;
}
#nav li{
	float: left;
	width: 78px;
	background: url(../images/button1.jpg)no-repeat;
	line-height: 33px;
}
#nav li:hover{
	background: url(../images/button1_bg.jpg)no-repeat;
}